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SMS01GAF bảng dữ liệu(PDF) 48 Page - Numonyx B.V |
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SMS01GAF bảng dữ liệu(HTML) 48 Page - Numonyx B.V |
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48 / 61 page ![]() Serial peripheral interface (SPI) mode SMSxxxAF, SMSxxxFF, SMSxxxBF 48/61 7.4.2 R1b Format This response token is similar to the R1 Format response token but for the option of adding the busy signal. The busy signal token can be any number of Bytes. A zero value indicates that the card is busy. A non-zero value indicates that the card is ready for the next command. 7.4.3 R2 Format This response token is two Bytes long. It is sent as a response to the SEND_STATUS command. 7.4.4 R3 Format This response token is sent by the card when a READ_OCR command is received. The response length is 5 Bytes. The structure of the first Byte is identical to that of the R1 Format response. The other four Bytes contain the OCR register. For more details about responses, please refer to the SD Memory Card Specification v.1.01. 7.5 Clearing Status Bits In the SPI mode, as described in the previous paragraphs, status bits are reported to the host in three different formats: R1 Format response, R2 Format response and data error token (the same bits may exist in several response types - e.g. Card ECC failed). As in the SD mode, error bits are cleared when read by the host, regardless of the response format. State indicators are cleared either when read by the host or in accordance with the card state. For more details, please refer to the SD Memory Card Specification. 7.6 SPI Bus Timings Figure 38 illustrates the basic Command/Response transaction in SPI mode (that is, when the card is ready). Figure 39 describes a Command/ Response transaction when the card is busy (R1b response format). For timings, refer to Table 25. Table 28. SPI Timing Symbols S Start Bit (=0) T Transmitter Bit (Host = 1, Card = 0) P One-Cycle Pull-up (=1) E End Bit (= 1) Z High impedance stage D Data Bits * Repeater |
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